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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731980.0, MPI für Astronomie / Publikationen_mpia
Giant molecular filaments in the Milky Way. II. The fourth Galactic quadrant
Authors:Abreu-Vicente, J.; Ragan, S.; Kainulainen, J.; Henning, T.; Beuther, H.; Johnston, K.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Astronomy and Astrophysics
Start Page:id. A131 (20 pp)
Audience:Not Specified
Abstract / Description:Context. Filamentary structures are common morphological features of the cold, molecular interstellar medium (ISM). Recent studies have discovered massive, hundred-parsec-scale filaments that may be connected to the large-scale, Galactic spiral arm structure. Addressing the nature of these giant molecular filaments (GMFs) requires a census of their occurrence and properties. <BR /> Aims: We perform a systematic search of GMFs in the fourth Galactic quadrant and determine their basic physical properties. <BR /> Methods: We identify GMFs based on their dust extinction signatures in the near- and mid-infrared and the velocity structure probed by 13CO line emission. We use the 13CO line emission and ATLASGAL dust emission data to estimate the total and dense gas masses of the GMFs. We combine our sample with an earlier sample from literature and study the Galactic environment of the GMFs. <BR /> Results: We identify nine GMFs in the fourth Galactic quadrant: six in the Centaurus spiral arm and three in inter-arm regions. Combining this sample with an earlier study using the same identification criteria in the first Galactic quadrant results in 16 GMFs, nine of which are located within spiral arms. The GMFs have sizes of 80-160 pc and 13CO-derived masses between 5-90 × 104M. Their dense gas mass fractions are between 1.5-37%, which is higher in the GMFs connected to spiral arms. We also compare the different GMF-identification methods and find that emission and extinction-based techniques overlap only partially, thereby highlighting the need to use both to achieve a complete census. Table A.2 is only available at the CDS via anonymous ftp to <A href=""></A> (<A href=""></A>) or via <A href=""></A>
Free Keywords:ISM: general; ISM: clouds; ISM: structure
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361 %R 10.1051/0004-6361/201527674
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